package com.osdp.common.util;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;

/**
 * spring bean 获取方法
 */
@Component
public class SpringContextUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    public static ApplicationContext getApplicationContext(){
        return applicationContext;
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringContextUtil.applicationContext = applicationContext;
    }

    /**
     * 通过名称获取 Bean.
     * @param beanName
     * @return
     */
    public static Object getBean(String beanName){
        return getApplicationContext().getBean(beanName);
    }

    /**
     * 通过class获取Bean.
     *
     * @param beanClass
     * @param <T>
     * @return
     */
    public static <T> T getBean(Class<T> beanClass){
        return getApplicationContext().getBean(beanClass);
    }
    /**
     * 通过name,以及Clazz返回指定的Bean
     *
     * @param name
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T getBean(String name, Class<T> clazz){
        return getApplicationContext().getBean(name,clazz);
    }
    /**
     * 获取HttpServletRequest
     */
    public static HttpServletRequest getHttpServletRequest(){
        return ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();
    }

    /**
     *
     * @return
     */
    public static String getDomain(){
        HttpServletRequest request = getHttpServletRequest();
        StringBuffer url = request.getRequestURL();
        return url.delete(url.length() - request.getRequestURI().length(),url.length()).toString();
    }

    public static String getOrigin() {
        HttpServletRequest request = getHttpServletRequest();
        return request.getHeader("Origin");
    }
}
